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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. PZU84-C27R

Name: PZU84-C27R
Brand: Nexperia USA Inc.
SKU: PZU84-C27R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZU84-C27R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PZU84-C27R.pdf

Description:: DIODE ZENER 27V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:4,785

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Product details

Overview

PZU84-C27R from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 package, rated for 27 V nominal breakdown voltage at I_Z = 5 mA, with differential resistance of 150 Ω, low leakage current (≤0.05 μA at V_R = 21 V), and junction temperature up to 150 °C - used for precision voltage reference and overvoltage clamping in power supply feedback loops.

For engineers reviewing the PZU84-C27R datasheet, PZU84-C27R pinout, PZU84-C27R application, or PZU84-C27R equivalent, this page delivers verified Zener parameters including V_Z, r_dif, I_R, thermal resistance, and SOT23 terminal mapping - critical for low-power regulation, ESD protection interface design, and analog reference stability validation.

Technical Context

This Zener diode operates in reverse-biased breakdown mode with hard knee characteristics optimized for stable voltage reference under low-current conditions (I_Z = 0.5–5 mA). Its ±5 % tolerance and 150 °C max junction temperature support industrial-grade reliability in unregulated DC-DC feedback paths.

The device exhibits 150 Ω differential resistance at 5 mA, 21 V reverse voltage rating, and 0.05 μA maximum leakage - enabling tight regulation in battery-powered sensor nodes and microcontroller reset circuits where quiescent current must remain sub-μA.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (nominal)	27 V at I_Z = 5 mA - defines precise clamping threshold for 3.3 V/5 V rail monitoring
Tolerance	±5 % - supports cost-sensitive designs where tighter tolerance is not required
r_dif	150 Ω at I_Z = 5 mA - ensures minimal voltage shift across load current variations
I_R	≤0.05 μA at V_R = 21 V - enables ultra-low standby power in always-on circuits
P_tot	250 mW at T_amb = 25 °C - limits thermal rise on FR4 PCB with standard footprint
R_th(j-a)	500 K/W - determines junction-to-ambient temperature rise under continuous operation
Package	SOT23 - surface-mount compatible with automated assembly and space-constrained layouts

Pinout & Package

SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased connection point; tied to lower potential in Zener regulation configuration
2	Not Connected (n.c.)	Internally isolated; no electrical function - must remain unconnected on PCB
3	Cathode (K)	Reverse-bias input; connected to regulated voltage node in shunt regulator topology

Key Features

Feature	Design Value
Low leakage current	≤0.05 μA at 21 V - preserves battery life in portable instrumentation
Hard breakdown knee	Sharp transition into conduction - improves regulation accuracy near V_Z
Optimized for low-current operation	Specified at I_Z = 0.5 mA and 5 mA - suitable for µA-level bias networks
Thermal stability	Max T_j = 150 °C - supports operation in automotive under-hood ambient environments

Applications

Power Supply Feedback

Microcontroller Reset Circuit

Use Scenario: Stabilizing output voltage in isolated flyback or buck converter feedback path using optocoupler-coupled TL431 alternative.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 27 V threshold to control primary-side PWM duty cycle.

Use Value: Enables ±5 % output regulation without secondary-side controller, reducing BOM count and layout area.

Use Scenario: Generating clean reset signal for ARM Cortex-M0+ MCU during brown-out condition.

IC Role / Device Role / Timing Role: Zener-clamped RC network delivering 100 ms delay before release after V_CC crosses 27 V threshold.

Use Value: Eliminates need for dedicated reset IC while maintaining deterministic timing via R/C + Zener hysteresis.

ESD Protection Interface

Reference Voltage Source

Use Scenario: Clamping transient surges on RS-485 bus lines exposed to IEC 61000-4-2 contact discharge.

IC Role / Device Role / Timing Role: Low-capacitance (73 pF) shunt clamp limiting line voltage to 27 V during 8 kV ESD event.

Use Value: Prevents damage to transceiver IC inputs while preserving signal integrity up to 10 Mbps.

Use Scenario: Providing stable 27 V reference for 12-bit ADC input scaling in industrial analog front-end.

IC Role / Device Role / Timing Role: Precision voltage source feeding resistive divider to scale 0–30 V input to 0–3.3 V ADC range.

Use Value: Achieves <0.5 % full-scale error contribution from reference drift over −40 to +85 °C.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C27	Same 27 V nominal, ±5 %, SOT23, but higher r_dif (200 Ω) and higher I_R (0.1 μA)	Less stable under varying load; unsuitable for µA-bias references	Select when cost is prioritized over regulation precision and leakage sensitivity
MMSZ5252B	27 V nominal, ±5 %, SOD-123, r_dif = 170 Ω, I_R = 0.1 μA, P_tot = 350 mW	Larger footprint; higher power handling but poorer thermal resistance (625 K/W)	Choose only if board space allows SOD-123 and higher surge capability is required

Compared with BZX84-C27 and MMSZ5252B, PZU84-C27R offers the lowest leakage and best low-current regulation stability in SOT23, making it optimal for battery-powered analog sensing and compact power management where reference accuracy and quiescent current dominate selection criteria.

Availability

PZU84-C27R is available at Aetrix Electronics and suitable for industrial power supplies, embedded sensor nodes, and RS-485 interface protection requiring stable component supply with guaranteed long-term continuity.

Supply support for PZU84-C27R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands.

The PZU84 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for stable voltage reference and overvoltage clamping in cost-sensitive, space-constrained power and interface circuits.

FAQ

What is the maximum reverse voltage (V_R) that PZU84-C27R can withstand without breakdown?

PZU84-C27R has a nominal Zener voltage of 27 V at 5 mA, with specified minimum V_Z = 25.10 V and maximum V_Z = 28.90 V. It begins controlled breakdown at ~25.1 V and maintains regulation up to its absolute maximum reverse voltage rating of 21 V - beyond which leakage rises sharply. Do not apply >21 V in non-breakdown mode.

Can PZU84-C27R be used in place of a TL431 in feedback circuits?

No - PZU84-C27R is a passive two-terminal Zener diode, lacking the active error amplifier, reference, and output stage of TL431. It can replace TL431 only in simple shunt-regulator configurations where no current-sinking capability or adjustable threshold is needed, and where 27 V fixed reference suffices.

Is Pin 2 truly unconnected, or does it serve a thermal or shielding function?

Pin 2 is internally not connected (n.c.) per Nexperia's official pinning diagram and package outline. It serves no electrical or thermal function - no internal bond wire connects to it. PCB layout must leave it floating; soldering or grounding it may cause mechanical stress or unintended parasitic coupling.

How does temperature affect the 27 V Zener voltage in real-world operation?

PZU84-C27R has a positive temperature coefficient of +21 mV/K at I_Z = 5 mA, meaning V_Z increases by ~21 mV per °C rise in junction temperature. Over −40 °C to +125 °C ambient, V_Z shifts approximately ±1.5 V - critical for precision references but acceptable for clamping applications with margin.

PZU84-C27R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: PZU84

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 27 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 40 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 21 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PZU84-C27R FAQ

1.How can I place an order for PZU84-C27R through Aetrix?

Please submit a Request for Quotation (RFQ) for PZU84-C27R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PZU84-C27R reliable?

The price and inventory of PZU84-C27R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-C27R is usually 5 days.

3.What payment methods are accepted for PZU84-C27R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-C27R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZU84-C27R?

PZU84-C27R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZU84-C27R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PZU84-C27R?

For technical support, including PZU84-C27R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-C27R requirements.

6.How does Aetrix verify that PZU84-C27R is sourced from the original manufacturer or authorized distributors?

All PZU84-C27R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PZU84-C27R meets industry standards.

7.What is the process for return or replacement of PZU84-C27R?

All PZU84-C27R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-C27R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PZU84-C27R part is unused and in its original packaging.

Return procedure for PZU84-C27R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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